01-22-2009
Generally this depends on the binary/program you started before echoing $?. If it has an error message as output, then you can see this. Usually it's written to stderr or stdout, depending how the programmer has written it.
The ranges you posted is probably more a guideline.
If you want to write your own error message translation, just test with "if/then/fi", if $? is >=1 or <=254 and print out the error you want.
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LEARN ABOUT DEBIAN
urxvtc
urxvt(1) RXVT-UNICODE urxvt(1)
NAME
urxvtc - control the urxvtd daemon
SYNOPSIS
urxvtc [same options as for urxvt]
DESCRIPTION
This manpage describes the urxvtc client program. It connects to the urxvtd daemon and requests a new terminal window. It takes the same
arguments as the urxvt program. The environment will also be respected. Currently, it always returns immediately after contacting the
daemon.
OPTIONS
All options that are valid for urxvt are valid for urxvtc, too. Please note that options are interpreted in the context of the daemon
process. However, as current working directory, process environment and any file descriptor (e.g. for "-pty-fd") are preserved, this rarely
makes a difference.
EXIT STATUS
If everything went well, urxvtc returns with an exit status of 0. If contacting the daemon fails, it exits with the exit status 2. In all
other error cases it returns with status 1.
This can be used to implement auto-starting behaviour, by checking for an exit status of 2, running "urxvtd -f -q" and retrying the call to
urxvtc, like this:
#!/bin/sh
urxvtc "$@"
if [ $? -eq 2 ]; then
urxvtd -q -o -f
urxvtc "$@"
fi
ENVIRONMENT
All environment variables of the current process will be made available to the new instance, and will be interpreted as if urxvt were
started directly.
RXVT_SOCKET
Both urxvtc and urxvtd use the environment variable RXVT_SOCKET to create a listening socket and to contact the urxvtd, respectively.
If the variable is missing, $HOME/.urxvt/urxvtd-<nodename> is used. The variable must specify the absolute path of the socket to
create.
SEE ALSO
urxvt(7), urxvtd(1)
9.15 2014-05-07 urxvt(1)